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What is a Boolean Operator? - Alliant International University

"What is a Boolean Operator?" Alliant Libraries Boolean Operators are simple words (AND, OR, NOT or AND NOT) used as conjunctions to combine or exclude keywords in a search, resulting in more focused and productive results. This should save time and effort by eliminating inappropriate hits that must be scanned before discarding. Using these operators can greatly reduce or expand the amount of records returned. Boolean operators are useful in saving time by focusing searches for more 'on-target' results that are more appropriate to your needs, eliminating unsuitable or inappropriate.

Example: A search on stock market AND trading includes results contains: stock market trading; trading on the stock market; and trading on the late afternoon stock market OR—either term (or both) will be in the returned document. (Broadens the search) Example: A search on ecology OR pollution includes results contains:

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  International, Stocks, Boolean

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